There’s a lot of existing evidence that replacing car trips with bike trips would benefit the environment. A 2015 study by the Institute for Transportation and Development Policy concluded that a dramatic increase (about 20 percent) in cycling worldwide could “cut carbon dioxide emissions from urban passenger transport by nearly 11 percent in 2050.” See Bicycle Magazine.
Better than just a bike, add a cargo bike. Carries a lot of stuff, plus the whole family. It's replacing the mini-van